Don't forget as well that on the A1200 at least (and I suspect other Amigas as well), not plugging anything into the audio outputs causes them to short and mix together, and so soldering like is shown there will result in mono sound from the Amiga outputs. It was intended for using with systems with only a mono input, so you didn't lose half your audio when you only use the left connector for example. It's a simple mod to remove this feature, but don't forget to do it while you're in there soldering away.